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Texas Instruments LP8556SQE-E09/NOPB
- Part No.:
- LP8556SQE-E09/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LP8556SQE-E09/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LP8556SQE-E09/NOPB from Texas Instruments is a high-efficiency LED backlight driver IC with integrated 0.19-Ω boost MOSFET, six precision current sinks (up to 50 mA per channel), and dual brightness control via PWM or I²C. It supports 2.7–20 V input, adaptive 7–43 V boost output, and operates at 312/625/1250 kHz switching frequencies for tablet LCD backlighting.
For engineers reviewing the LP8556SQE-E09/NOPB datasheet, LP8556SQE-E09/NOPB pinout, LP8556SQE-E09/NOPB application, or LP8556SQE-E09/NOPB equivalent, key selection considerations include its 6-channel WLED sink configuration, programmable overvoltage protection thresholds, phase-shifted PWM dimming for audible noise reduction, and DSBGA-20 package compatibility with space-constrained portable designs.
Technical Context
The LP8556SQE-E09/NOPB implements an asynchronous boost converter with CPM (current-programmed mode) control and adaptive output voltage regulation-dynamically adjusting VBOOST to the minimum required level across varying LED forward voltage and temperature conditions. Its six independent current sinks feature 15-bit PWM dimming resolution and proprietary adaptive dimming to maximize optical efficiency.
Control is implemented via either hardware PWM (75 Hz–25 kHz, 10-bit resolution) or I²C interface (400 kHz compliant), with EPROM-configured settings including boost frequency, OVP threshold (6 options), and channel count (fixed to 6 for this variant). Fault protection includes UVLO, TSD, OCP, LED open/short detection, and up to 6-level OVP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 20 V - powers directly from multi-cell Li-ion batteries; internal LDO derives VLDO from VDD. |
| Boost Output Range | 7 V to 43 V - supports 3–12 series WLEDs per channel; range set by EPROM (VBOOST_RANGE = 1). |
| LED Channel Count | 6 - fixed for LP8556SQE-E09/NOPB; all six sinks (LED1–LED6) are active and configurable. |
| Max Sink Current | 50 mA per channel - verified across –30°C to +85°C ambient; typical accuracy ±1% at 23 mA. |
| Switching Frequency | 312 / 625 / 1250 kHz - selectable via external RFSET resistor or factory EPROM (BOOST_FREQ = 10). |
| I²C Interface | Standard-mode (400 kHz) - supports SDA/SCL pins for register-based brightness, fault status, and configuration. |
| Fault Protection | UVLO, OCP, OVP (6 thresholds), TSD, LED open/short detection - enables robust operation without external supervision. |
Pinout & Package
LP8556SQE-E09/NOPB is housed in a 20-pin, 0.4-mm pitch DSBGA package (2.401 mm × 1.74 mm max body size), optimized for ultra-thin tablet backlight modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Boost switch drain | Connects to inductor and diode anode; carries peak currents up to 2.07 A (DSBGA-limited). |
| GND_SW | Switch source ground | Dedicated low-inductance return path for boost switch; must be isolated from digital GND. |
| LED1–LED6 | Current sink outputs | Each drives one WLED string; sinking capability up to 50 mA with <200 mV saturation voltage. |
| VBOOST | Boost output sense | Feedback and OVP monitoring node; requires low-ESR capacitor bank placed adjacent to pin. |
| VDD | Main power input | Supplies internal LDO (2.7–20 V); powers logic, analog blocks, and gate drivers. |
| EN / VDDIO | Enable & I/O reference | Active-high enable; also supplies 1.62–3.6 V reference for PWM, SDA, SCL inputs. |
| PWM | Hardware dimming input | Accepts 75 Hz–25 kHz PWM signal; 10-bit resolution; must tie to GND if unused. |
| SDA / SCL | I²C interface | Standard-mode bidirectional data/clock; supports register read/write for full configuration and status reporting. |
| ISET | Current set reference | Connects RISET resistor to GND to program nominal LED current (23 mA for E09 variant). |
| FSET | Frequency set input | Connects RFSET resistor to GND to select boost/PWM frequency; floating if EPROM-configured. |
| VLDO | LDO output | 3.0 V ±50 mV regulated output; powers internal circuitry; requires 10 µF CVLDO capacitor. |
| GND | System ground | Multiple dedicated GND pads (including GND_SW and DAP) require separate thermal and low-noise routing. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VBOOST control | Maintains output voltage just above LED string Vf sum, reducing power loss and heat generation by up to 30% vs fixed-output boost. |
| Phase-shifted PWM dimming | Staggered timing across LED channels eliminates beat-frequency-induced audible coil whine and allows smaller COUT. |
| Programmable slew rate & spread spectrum | Configurable SW edge rates (1.9–7.5 V/ns) and ±1% frequency dither reduce EMI peaks by >10 dB in conducted emissions. |
| 6-level OVP programmability | Enables precise matching to LED string Vf tolerance stack-up (e.g., 34.5 V max for LP8556SQE-E09/NOPB) without overdesign. |
| Integrated fault diagnostics | Real-time reporting of open/short LED, OCP, OVP, UVLO, and TSD via I²C STATUS register-no external monitoring needed. |
Applications
| Tablet LCD Backlight | Ultrabook Display Driver |
|---|---|
Use Scenario: Driving 6 parallel WLED strings (3–5 LEDs each) in a 10.1-inch IPS LCD panel with dynamic contrast control. IC Role / Device Role / Timing Role: Primary LED current controller and adaptive boost regulator; manages PWM dimming synchronization and VBOOST headroom in real time. Use Value: Enables >90% boost efficiency at 380 mA total load while maintaining <±1% current matching across channels for uniform luminance. |
Use Scenario: Powering dual-zone edge-lit display with independent brightness control for upper/lower screen regions. IC Role / Device Role / Timing Role: Dual-role driver-uses 4 channels for top zone, 2 for bottom; leverages I²C for zone-specific gamma correction and thermal derating. Use Value: Reduces BOM count by eliminating discrete boost controllers and current-sense amplifiers; supports seamless 15-bit dimming transitions. |
| Industrial HMI Panel | Medical Diagnostic Display |
Use Scenario: Backlighting a ruggedized 7-inch resistive-touch LCD operating in –30°C to +70°C ambient. IC Role / Device Role / Timing Role: Robust LED driver with extended temperature support and fault logging; uses adaptive dimming to compensate for LED Vf drift at low temperature. Use Value: Eliminates luminance shift over temperature via closed-loop VBOOST adjustment and maintains 23 mA channel current within ±4% across full range. |
Use Scenario: High-reliability backlight for DICOM-compliant 12-bit grayscale medical monitor requiring flicker-free operation. IC Role / Device Role / Timing Role: Precision current sink with phase-shifted PWM and spread-spectrum switching to suppress EMI that could interfere with analog sensor signals. Use Value: Achieves <0.01% RMS flicker at 100% brightness and passes EN 60601-1-2 Class B conducted emissions without shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP8557TME-E09/NOPB | Same 6-channel architecture but in 24-pin WQFN package; higher ISW_LIM (2.6 A vs 2.07 A); supports wider VBOOST range (7–48 V). | Better suited for high-current, high-Vf LED strings (>35 V) and thermally demanding layouts where DSBGA thermal resistance (66.2°C/W) is limiting. | Select LP8557TME-E09/NOPB when board layout allows larger footprint and system requires >2.07 A boost current or >43 V output. |
| TPS61165DRVR | Single-channel 40-V boost LED driver with 1.2-MHz fixed frequency; no I²C, no adaptive VBOOST, no multi-channel sync. | Requires external current-setting resistors and separate PWM generators for multi-string operation; lacks integrated fault reporting. | Choose TPS61165DRVR only for cost-sensitive single-string designs where programmability and diagnostics are not required. |
Compared with LP8556SQE-E09/NOPB, LP8557TME-E09/NOPB offers higher thermal performance and output headroom at the expense of board area, while TPS61165DRVR provides lower integration and reduced feature set for simplified single-string implementations.
Availability
LP8556SQE-E09/NOPB is available at Aetrix Electronics and suitable for tablet backlighting, ultrabook displays, industrial HMIs, and medical diagnostic monitors requiring stable component supply, long-term manufacturability, and automotive-grade reliability validation.
Supply support for LP8556SQE-E09/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies, with leadership in high-efficiency LED drivers and precision power solutions.
The LP8556 product line was designed specifically for high-density, low-profile LCD backlight systems in portable consumer electronics-emphasizing adaptive efficiency, multi-channel synchronization, and comprehensive fault resilience.
FAQ
What is the maximum LED string voltage supported by LP8556SQE-E09/NOPB?
The LP8556SQE-E09/NOPB supports a boost output voltage range of 7 V to 43 V, configured via factory EPROM (VBOOST_RANGE = 1). This allows driving up to 12 white LEDs in series per channel at typical forward voltages, with OVP threshold set to 34.5 V for this variant-verified across –30°C to +85°C ambient.
Does LP8556SQE-E09/NOPB support I²C communication out of the box?
Yes, LP8556SQE-E09/NOPB is configured as "PWM and I²C" (E09 option), enabling full register access via standard-mode I²C (400 kHz) on SDA and SCL pins. No external pull-ups or configuration jumpers are required-only proper VDDIO biasing and I²C bus termination.
How is LED current set on LP8556SQE-E09/NOPB?
LED current is set using the ISET pin: a resistor (RISET) connected between ISET and GND programs the nominal sink current. For LP8556SQE-E09/NOPB, the factory-trimmed value targets 23 mA per channel, with ±1% typical accuracy at 25°C and ±4% over full temperature range.
Can LP8556SQE-E09/NOPB drive fewer than six LED channels?
Yes, LP8556SQE-E09/NOPB supports configurable channel count (1–6) via I²C registers. Unused channels (e.g., LED4–LED6) may be disabled or left floating; current sinks automatically enter high-impedance state when not enabled, minimizing leakage (<1 µA per channel).
What thermal considerations apply to LP8556SQE-E09/NOPB in DSBGA package?
LP8556SQE-E09/NOPB in DSBGA-20 has a junction-to-ambient thermal resistance (RθJA) of 66.2°C/W. To maintain TJ ≤125°C at 85°C ambient, total power dissipation must stay below 550 mW-achieved by optimizing PCB copper area under the DAP and minimizing boost switch losses through proper inductor selection and layout.
LP8556SQE-E09/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 20V
- Voltage - Output:
- 7V ~ 43V
- Current - Output / Channel:
- 50mA
- Frequency:
- 312kHz, 625kHz, 1250kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LP8556SQE-E09/NOPB FAQ
1.How can I place an order for LP8556SQE-E09/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8556SQE-E09/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LP8556SQE-E09/NOPB reliable?
The price and inventory of LP8556SQE-E09/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP8556SQE-E09/NOPB is usually 5 days.
3.What payment methods are accepted for LP8556SQE-E09/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8556SQE-E09/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8556SQE-E09/NOPB?
LP8556SQE-E09/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8556SQE-E09/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LP8556SQE-E09/NOPB?
For technical support, including LP8556SQE-E09/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8556SQE-E09/NOPB requirements.
6.How does Aetrix verify that LP8556SQE-E09/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8556SQE-E09/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP8556SQE-E09/NOPB meets industry standards.
7.What is the process for return or replacement of LP8556SQE-E09/NOPB?
All LP8556SQE-E09/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8556SQE-E09/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LP8556SQE-E09/NOPB part is unused and in its original packaging.
Return procedure for LP8556SQE-E09/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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